/* ========================================
   CSS Variables & Design Tokens
======================================== */
:root {
    --primary-400: #26b0ff;
    --primary-500: #00a0ff;
    --primary-600: #0080cc;
    --primary-700: #006099;
    --primary-800: #004066;
    --neutral-50: #f8fafc;
    --neutral-100: #f1f5f9;
    --neutral-200: #e2e8f0;
    --neutral-300: #cbd5e1;
    --neutral-400: #94a3b8;
    --neutral-500: #64748b;
    --neutral-600: #475569;
    --neutral-700: #334155;
    --neutral-800: #1e293b;
    --neutral-900: #0f172a;
    --neutral-950: #020617;
    --gradient-primary: linear-gradient(135deg, var(--primary-500) 0%, var(--primary-700) 100%);
    --gradient-hero: linear-gradient(135deg, #0f172a 0%, #1e3a5f 50%, #0f172a 100%);
    --gradient-text: linear-gradient(135deg, var(--primary-400) 0%, #67e8f9 100%);
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    --shadow-glow: 0 0 40px rgba(0, 160, 255, 0.3);
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
}

*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

/* ========================================
   PROTECCIÓN DE CONTENIDO (CSS)
======================================== */

/* Deshabilitar selección de texto */
body {
    -webkit-user-select: none;
    -moz-user-select: none;
    -ms-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}

/* Deshabilitar arrastre de imágenes */
img {
    -webkit-user-drag: none;
    -khtml-user-drag: none;
    -moz-user-drag: none;
    -o-user-drag: none;
    user-drag: none;
    pointer-events: none;
}

/* Ocultar contenido al imprimir */
@media print {
    body {
        display: none !important;
    }

    html::before {
        content: "Este contenido está protegido y no puede ser impreso.";
        display: block;
        padding: 50px;
        text-align: center;
        font-size: 24px;
        color: #333;
    }
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--neutral-100);
    background: var(--neutral-950);
    -webkit-font-smoothing: antialiased;
}

a {
    color: inherit;
    text-decoration: none;
}

ul,
ol {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 1.5rem;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 200;
    background: rgba(15, 23, 42, 0.9);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
}

.logo-accent {
    color: var(--primary-400);
}

.nav-menu {
    display: flex;
    gap: 2rem;
}

.nav-link {
    font-weight: 500;
    color: var(--neutral-400);
    transition: var(--transition-fast);
}

.nav-link:hover {
    color: var(--neutral-100);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 0.5rem;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--neutral-100);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-weight: 600;
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px rgba(0, 160, 255, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 160, 255, 0.5);
}

.btn-secondary {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.btn-lg {
    padding: 1.25rem 2.5rem;
}

/* Hero */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    z-index: -1;
    background: var(--gradient-hero);
}

.hero-particles {
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at 20% 30%, rgba(0, 160, 255, 0.15) 0%, transparent 40%),
        radial-gradient(circle at 80% 70%, rgba(103, 232, 249, 0.1) 0%, transparent 40%);
}

.hero-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
    padding: 4rem 1.5rem;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.5rem;
    background: rgba(0, 160, 255, 0.1);
    border: 1px solid rgba(0, 160, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    color: #80d4ff;
    margin-bottom: 1.5rem;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 3.75rem);
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: 1.5rem;
}

.gradient-text {
    background: var(--gradient-text);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-description {
    font-size: 1.125rem;
    color: var(--neutral-400);
    max-width: 700px;
    margin: 0 auto 2rem;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin-bottom: 2rem;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2.25rem;
    font-weight: 800;
    color: var(--primary-400);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.hero-scroll {
    position: absolute;
    bottom: 2rem;
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--neutral-500);
    font-size: 0.75rem;
}

/* Sections */
.section-header {
    text-align: center;
    margin-bottom: 3rem;
}

.section-badge {
    display: inline-block;
    padding: 0.25rem 1rem;
    background: rgba(0, 160, 255, 0.1);
    border: 1px solid rgba(0, 160, 255, 0.2);
    border-radius: var(--radius-full);
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
}

.section-title {
    font-size: clamp(2rem, 4vw, 2.25rem);
    font-weight: 800;
    margin-bottom: 1rem;
}

.section-description {
    font-size: 1.125rem;
    color: var(--neutral-400);
    max-width: 600px;
    margin: 0 auto;
}

/* Modules */
.modules {
    padding: 6rem 0;
    background: linear-gradient(180deg, var(--neutral-950) 0%, var(--neutral-900) 100%);
}

.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 1.5rem;
}

.module-card {
    position: relative;
    padding: 1.5rem;
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.8), rgba(15, 23, 42, 0.8));
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-xl);
    transition: var(--transition-base);
}

.module-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-base);
}

.module-card:hover {
    transform: translateY(-4px);
    border-color: rgba(0, 160, 255, 0.2);
    box-shadow: var(--shadow-glow);
}

.module-card:hover::before {
    opacity: 1;
}

.module-icon {
    width: 56px;
    height: 56px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 160, 255, 0.1);
    border-radius: var(--radius-lg);
    font-size: 1.75rem;
    margin-bottom: 1.5rem;
}

.module-number {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--primary-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.5rem;
}

.module-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.module-description {
    font-size: 0.875rem;
    color: var(--neutral-400);
    margin-bottom: 1rem;
    line-height: 1.7;
}

.module-topics {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-bottom: 1rem;
}

.module-topics li {
    padding: 0.25rem 0.5rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    color: var(--neutral-400);
}

.module-link {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--primary-400);
    transition: var(--transition-fast);
}

.module-link:hover {
    gap: 0.75rem;
}

/* Benefits */
.benefits {
    padding: 6rem 0;
    background: var(--neutral-950);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
}

.benefit-card {
    padding: 1.5rem;
    background: rgba(30, 41, 59, 0.4);
    border: 1px solid rgba(255, 255, 255, 0.03);
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition-base);
}

.benefit-card:hover {
    background: rgba(30, 41, 59, 0.6);
    transform: translateY(-2px);
}

.benefit-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.benefit-card h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

.benefit-card p {
    font-size: 0.875rem;
    color: var(--neutral-400);
}

/* CTA */
.cta {
    padding: 6rem 0;
    background: linear-gradient(135deg, var(--primary-800), var(--neutral-900));
}

.cta-content {
    text-align: center;
}

.cta h2 {
    font-size: clamp(1.75rem, 4vw, 1.875rem);
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.cta p {
    font-size: 1.125rem;
    color: var(--neutral-300);
    margin-bottom: 1.5rem;
}

/* Footer */
.footer {
    padding: 3rem 0 1rem;
    background: var(--neutral-950);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 2rem;
}

.footer-brand p {
    color: var(--neutral-500);
    font-size: 0.875rem;
    margin-top: 1rem;
}

.footer-links h4 {
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 1rem;
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--neutral-500);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: var(--primary-400);
}

.footer-bottom {
    padding-top: 1.5rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    text-align: center;
}

.footer-bottom p {
    font-size: 0.875rem;
    color: var(--neutral-600);
}

/* Module Page */
.module-page {
    padding-top: 72px;
}

.module-hero {
    padding: 3rem 0;
    background: var(--gradient-hero);
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.module-hero-content {
    max-width: 800px;
}

.breadcrumb {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--neutral-500);
    margin-bottom: 1rem;
}

.breadcrumb a:hover {
    color: var(--primary-400);
}

.module-hero h1 {
    font-size: clamp(2rem, 5vw, 3rem);
    font-weight: 800;
    margin-bottom: 1rem;
}

.module-meta {
    display: flex;
    gap: 2rem;
    color: var(--neutral-400);
    font-size: 0.875rem;
}

.module-content {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 3rem;
    padding: 3rem 0;
}

/* Sidebar */
.module-sidebar {
    position: sticky;
    top: 100px;
    height: fit-content;
}

.sidebar-nav {
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    padding: 1rem;
}

.sidebar-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--neutral-400);
    text-transform: uppercase;
    letter-spacing: 0.1em;
    margin-bottom: 0.75rem;
}

.sidebar-nav ul {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.sidebar-nav a {
    display: block;
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    color: var(--neutral-400);
    border-radius: var(--radius-md);
    transition: var(--transition-fast);
}

.sidebar-nav a:hover,
.sidebar-nav a.active {
    background: rgba(0, 160, 255, 0.1);
    color: var(--primary-400);
}

/* Content */
.module-main {
    min-width: 0;
}

.content-section {
    margin-bottom: 3rem;
    padding-bottom: 3rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.content-section:last-child {
    border-bottom: none;
}

.content-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    padding-bottom: 0.5rem;
    border-bottom: 2px solid var(--primary-500);
    display: inline-block;
}

.content-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 1.5rem 0 1rem;
}

.content-section h4 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--neutral-200);
    margin: 1.25rem 0 0.75rem;
}

.content-section p {
    color: var(--neutral-300);
    margin-bottom: 1rem;
    line-height: 1.8;
}

.content-section strong {
    color: var(--neutral-100);
    font-weight: 600;
}

/* Definition Box */
.definition-box {
    background: linear-gradient(135deg, rgba(0, 160, 255, 0.1), rgba(0, 128, 204, 0.05));
    border-left: 4px solid var(--primary-500);
    border-radius: 0 var(--radius-lg) var(--radius-lg) 0;
    padding: 1.25rem;
    margin: 1.25rem 0;
}

.definition-box h4 {
    color: var(--primary-400);
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.definition-box p {
    margin-bottom: 0;
}

/* Info Box */
.info-box {
    background: rgba(59, 130, 246, 0.1);
    border: 1px solid rgba(59, 130, 246, 0.2);
    border-radius: var(--radius-lg);
    padding: 1.25rem;
    margin: 1.25rem 0;
}

.info-box.warning {
    background: rgba(245, 158, 11, 0.1);
    border-color: rgba(245, 158, 11, 0.2);
}

.info-box.success {
    background: rgba(16, 185, 129, 0.1);
    border-color: rgba(16, 185, 129, 0.2);
}

.info-box-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
}

/* Formula */
.formula-box {
    background: rgba(30, 41, 59, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    margin: 1.25rem 0;
    text-align: center;
    overflow-x: auto;
}

.formula {
    font-family: 'Courier New', monospace;
    font-size: 1.125rem;
    color: #80d4ff;
    margin: 1rem 0;
}

.formula-description {
    text-align: left;
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

.formula-description p {
    margin-bottom: 0.25rem;
    font-size: 0.875rem;
}

/* Tables */
.table-container {
    overflow-x: auto;
    margin: 1.25rem 0;
    border-radius: var(--radius-lg);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.875rem;
}

thead {
    background: rgba(0, 160, 255, 0.1);
}

th {
    padding: 0.75rem 1rem;
    text-align: left;
    font-weight: 600;
    white-space: nowrap;
}

td {
    padding: 0.75rem 1rem;
    color: var(--neutral-300);
    border-top: 1px solid rgba(255, 255, 255, 0.05);
}

tbody tr:hover {
    background: rgba(255, 255, 255, 0.02);
}

/* Lists */
.content-section ul:not(.module-topics):not(.sidebar-nav ul),
.content-section ol {
    margin: 1rem 0;
    padding-left: 1.5rem;
}

.content-section ul:not(.module-topics):not(.sidebar-nav ul) li,
.content-section ol li {
    color: var(--neutral-300);
    margin-bottom: 0.5rem;
    line-height: 1.7;
}

.content-section ul:not(.module-topics):not(.sidebar-nav ul) {
    list-style: disc;
}

.content-section ol {
    list-style: decimal;
}

/* Module Nav */
.module-navigation {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    padding: 2rem 0;
    border-top: 1px solid rgba(255, 255, 255, 0.05);
    margin-top: 2rem;
}

.nav-prev,
.nav-next {
    flex: 1;
    padding: 1rem;
    background: rgba(30, 41, 59, 0.5);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-lg);
    transition: var(--transition-base);
}

.nav-next {
    text-align: right;
}

.nav-prev:hover,
.nav-next:hover {
    background: rgba(30, 41, 59, 0.8);
    border-color: rgba(0, 160, 255, 0.2);
}

.nav-label {
    font-size: 0.75rem;
    color: var(--neutral-500);
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.nav-title {
    font-weight: 600;
}

/* Responsive */
@media (max-width: 1024px) {
    .module-content {
        grid-template-columns: 1fr;
    }

    .module-sidebar {
        position: relative;
        top: 0;
    }

    .sidebar-nav ul {
        flex-direction: row;
        flex-wrap: wrap;
    }

    .footer-content {
        grid-template-columns: 1fr 1fr;
    }
}

@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 72px;
        left: 0;
        right: 0;
        background: var(--neutral-900);
        flex-direction: column;
        padding: 1.5rem;
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: var(--transition-base);
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }

    .nav-toggle {
        display: flex;
    }

    .hero-stats {
        gap: 1.5rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .modules-grid {
        grid-template-columns: 1fr;
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: 1.5rem;
    }

    .module-navigation {
        flex-direction: column;
    }

    .nav-next {
        text-align: left;
    }
}

/* Diagram Images */
.diagram-container {
    margin: 1.5rem 0;
    text-align: center;
    background: rgba(15, 23, 42, 0.6);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    padding: 1rem;
    overflow: hidden;
}

.diagram-container img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-md);
    margin: 0 auto;
}

.diagram-container.full-width img {
    width: 100%;
}

.diagram-caption {
    margin-top: 0.75rem;
    font-size: 0.875rem;
    color: var(--neutral-400);
    font-style: italic;
}

.diagram-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 1.5rem;
    margin: 1.5rem 0;
}

.diagram-row .diagram-container {
    margin: 0;
}